GDBJIT: do not register NULL lineinfo when gdbjit integration is disabled.

src/codegen.cc

 // Copyright 2010 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 249 matching lines @@
   }
 
   InLoopFlag in_loop = info->is_in_loop() ? IN_LOOP : NOT_IN_LOOP;
   Code::Flags flags = Code::ComputeFlags(Code::FUNCTION, in_loop);
   Handle<Code> code = MakeCodeEpilogue(cgen.masm(), flags, info);
   // There is no stack check table in code generated by the classic backend.
   code->SetNoStackCheckTable();
   CodeGenerator::PrintCode(code, info);
   info->SetCode(code);  // May be an empty handle.
 #ifdef ENABLE_GDB_JIT_INTERFACE
-  if (!code.is_null()) {
+  if (FLAG_gdbjit && !code.is_null()) {
     GDBJITLineInfo* lineinfo =
         masm.positions_recorder()->DetachGDBJITLineInfo();
 
     GDBJIT(RegisterDetailedLineInfo(*code, lineinfo));
   }
 #endif
   return !code.is_null();
 }
 
 
@@ skipping 206 matching lines @@
   int result = save_doubles_ ? 1 : 0;
 #ifdef _WIN64
   return result | ((result_size_ == 1) ? 0 : 2);
 #else
   return result;
 #endif
 }
 
 
 } }  // namespace v8::internal